The experienced centre-back was part of a Bolton side that conceded just three goals in their six games during last month.
Nominated alongside Baptiste are Barrow wing-back Patrick Brough, Cambridge United midfielder Wes Hoolahan and Exeter City midfielder Matt Jay.
Ian Evatt has also been nominated for manager of the month, having also won the award in February and November.
The Bolton boss mirrored the previous month’s results with five wins and a draw from six games as Wanderers pushed into the play-off positions for the first time this season.
Nominated alongside Evatt are Stevenage’s Alex Revell, Barrow’s Rob Kelly and Derek Adams of Morecambe. The winners of the awards will be announced on Friday.